filesystem deadlock, process in vodead state

[Yamagi Burmeister]

Hello,
last week I've observed a similar deadlock on a FreeBSD 10.2 machine
with UFS filesystem. I haven't saved the procstat output because I
suspected broken hardware (The SSD wearout indicator was down to 22.
There weren't any ATA errors in dmesg), but as far as I remember the
kernel stacks looked similar. ufs_open() instead of zfs_freebsd_open()
of course.

Regards,
Yamagi

On Thu, 19 Nov 2015 10:41:04 +0100
Robert Schulze <rs at bytecamp.net> wrote:

> Hi,
> 
> on an SSD-only mirrored pool which was idle for about 30 days, I noticed
> a stuck chksetuid run from periodic. The "find" process is stuck on
> vodead state.
> 
> I found out which directory is affected via procstat -f and tried to ls
> it, now this ls is stuck in above state, too (no surprise).
> 
> procstat -kk output is:
> 
>  1816 102485 find             -                mi_switch+0xe1
> sleepq_wait+0x3a _sleep+0x287 vnode_create_vobject+0x100
> zfs_freebsd_open+0xf5 VOP_OPEN_APV+0xa1 vn_open_vnode+0x234
> vn_open_cred+0x33e kern_openat+0x26f amd64_syscall+0x33a Xfast_syscall+0xfb
> 
> 71376 102400 ls               -                mi_switch+0xe1
> sleepq_wait+0x3a _sleep+0x287 vnode_create_vobject+0x100
> zfs_freebsd_open+0xf5 VOP_OPEN_APV+0xa1 vn_open_vnode+0x234
> vn_open_cred+0x33e kern_openat+0x26f amd64_syscall+0x33a Xfast_syscall+0xfb
> 
> The processes are not killable.
> So what is this state and how to fix the deadlocked filesystem? I'm able
> to give any debugging information, just give me some pointers.
> 
> # uname: FreeBSD 10.2-RELEASE-p5 #1 r289218
> 
> # zpool status
> 
>   pool: home
>  state: ONLINE
>   scan: none requested
> config:
> 
> 	NAME               STATE     READ WRITE CKSUM
> 	home               ONLINE       0     0     0
> 	  mirror-0         ONLINE       0     0     0
> 	    gpt/mirror0-a  ONLINE       0     0     0
> 	    gpt/mirror0-b  ONLINE       0     0     0
> 	  mirror-1         ONLINE       0     0     0
> 	    gpt/mirror1-a  ONLINE       0     0     0
> 	    gpt/mirror1-b  ONLINE       0     0     0
> 	  mirror-2         ONLINE       0     0     0
> 	    gpt/mirror2-a  ONLINE       0     0     0
> 	    gpt/mirror2-b  ONLINE       0     0     0
> 	  mirror-3         ONLINE       0     0     0
> 	    gpt/mirror3-a  ONLINE       0     0     0
> 	    gpt/mirror3-b  ONLINE       0     0     0
> 
> errors: No known data errors
> 
> 
> with kind regards,
> Robert Schulze
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